interface User{
    name:String;
    age:number;
    school:String;
}
interface Admin extends User{
    isAdmin:boolean;
}
class Bob implements Admin{
    name:"Bob";
    age:12;
    school:"xtu";
    isAdmin:true;
}
let Alice:Admin={
    name:"Alice",
    age:12,
    school:"xtu",
    isAdmin:true,
};
for(let key in Alice){
    console.log(key);
}